package com.yr.dao;

import com.yr.po.Blog;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * Created by limi on 2017/10/20.
 */
public interface BlogRepository extends JpaRepository<Blog, Long>, JpaSpecificationExecutor<Blog> {
    //博客最新推荐recommend为true
    @Query("select b from Blog b where b.recommend = true")
    List<Blog> findTop(Pageable pageable);
    //搜索功能
    @Query("select b from Blog b where b.title like ?1 or b.content like ?1")
    Page<Blog> findByQuery(String query,Pageable pageable);

    //浏览次数+1
    @Transactional
    @Modifying
    @Query("update Blog b set b.views = b.views+1 where b.id = ?1")
    int updateViews(Long id);
    //查询年份的分组有几个年份，'date_format'日期格式化，'%Y'匹配YYYY年份格式
    @Query("select function('date_format',b.updateTime,'%Y') as year from Blog b group by function('date_format',b.updateTime,'%Y') order by year desc ")
    List<String> findGroupYear();

    @Query("select b from Blog b where function('date_format',b.updateTime,'%Y') = ?1")
    List<Blog> findByYear(String year);
}
